Year	% (cumulative)
1974	1.575080037117
1981	2.17615008354187
2001	4.91579008102417
2011	14.3889799118042
2012	14.6490602493286
2013	12.9065504074097
2014	13.226110458374
2015	18.1114597320557
2016	18.6195507049561
2017	19.189640045166
2018	19.8910598754883
2019	20.5609703063965
2021	22.2650909423828